Rust proofing process



United States Patent RUST PROOFIN G PROCESS George R. Peck, Corpus Christi, Tex., assignor of onethird to L. W. Wolford, Sr., and one-third to Duane C. Harper, both of Corpus Christi, Tex.

No Drawing. Application June 19, 1956 Serial No. 592,247

1 Claim. (Cl. 11749) This invention relates to a rust proofing process, and has for one of its objects the production of a simple and eflicient process for rendering any metal with an iron content rust proof, by freezing the metal, and then raising the temperature thereof while the metal is immersed in a bath of oil having a graphite base.

A further object of this invention is the production of a simple and efficient rust proofing process for rendering metal parts of guns, constructed metal machinery and prefabricated metal objects, parts, and the like, rust proof without the necessity of removing or disassembling the metal parts thereof, it only being advisable for convem'ence to remove the wooden parts, such as, for instance, the stock and the like of a gun when treating the metal parts thereof.

Other objects and advantages of the present invention will appear throughout the following specification and claim.

Specifically, the improved rust proofing process consists of first, freezing any selected metal with an iron content. This is accomplished by (first) subjecting the metal to a temperature of from 32 to 0 F., until the metal is covered by frost. Then (second) all frost and moisture are removed from the metal in any conventional manner. (Third) the metal is then immersed in a bath of oil having a graphite base. Pyroil, manufactured by The Pyroil Corporation, of La Crosse, Wisconsin, which has a graphite base and is generally used as an additive for motor oil, has been found to provide an efficient oil bath. Other similar oils having a graphite base may be used within the scope of the invention. (Fourth) the temperatures of the oil bath and immersed metal are increased to a higher degree than the metal eventually is to be subjected, when used. The temperature rise, from a few degrees above freezing to 100 or 250 F., may be accomplished by any of the well-known means common to the trade, and the freezing means may be of the conventional or well-known type. (Fifth) the metal is then removed from the bath of oil and is subjected to normal atmospheric temperature.

It should be understood that various degrees of hardened metal will require various degrees of freezing ice temperature, in some cases requiring below zero temperature to properly or sufiiciently exclude all moisture and air from the metal. Furthermore, the various degrees of hardened metal may require an increase of temperature of the oil bath well above the temperatures mentioned under normal procedure in the specification to accomplish the desired objects of the invention.

As the metal cools off to normal atmospheric temperature, the surplus oil which has impregnated the molecules of the metal while heating, will be squeezed out or ejected from the pores of the metal at the surface thereof. The oil may then be wiped from the surface of the metal, thereby avoiding an unnecessary oily surface upon the metal which might prove objectionable while handling.

The present process consists therefore, of contracting the metal, then expanding the metal while subjecting the same to a heated oil bath to impregnate the molecules of the metal to its very center of the metal with oil, and finally returning the metal to a normal atmospheric temperature to remove excess oil from the metal.

The present process has been successfully used in rust proofing tools, guns, pipe, and may be used for other metal articles, metal sheets, and metal objects having an iron content within the scope of the invention. It should be noted that the present invention is broad in its concept, and it is not desired to limit the invention at this time to specific temperatures stated herein.

Having described the invention, what I claim as new A rust proofing process comprising subjecting metal having an iron content to a freezing temperature until the metal is covered by frost thereby excluding all moisture and air from the metal, then removing all frost and moisture from the pores of the metal, then immersing the metal in an oil bath having a graphite base, then increasing the temperature of the oil bath and metal to a higher degree of temperature than the metal eventually is to be subjected thereby changing any remaining moisture in the metal to steam and in this manner extruding the remaining moisture from the metal, the temperature of the oil and metal also causing expansion to impregnate and encircle each molecule of the metal and to give each molecule a protective film of oil, and finally removing the metal from the bath of oil and subjecting the metal to normal atmospheric temperature.

References Cited in the file of this patent UNITED STATES PATENTS 1,210,7 2 Sultzer Jan. 2, 1917 1,460,317 Duke June 26, 1923 1,717,171 Schorger June 11, 1929 2,015,893 Greenleaf Oct. 1, 1935 2,134,319 Stone Oct. 25, 1938 2,357,269 Russell et al. Aug. 29, 1944 

